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參數(shù)資料
| 型號： | MQHL-28-2R5S-X-ES |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | MODULE-12 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大小： | 4154K |
| 代理商： | MQHL-28-2R5S-X-ES |
Product # MQHL-28-2R5S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005898 Rev. 1
05/19/11
Page 7
Output:
Current:
2.5V
20A
MQHL-28-2R5S
Application Section
INPUT UNDER-VOLTAGE SHUTDOWN: The MQHL
converter has an under-voltage shutdown feature that
ensures the converter will be off if the input voltage is too
low. The input voltage turn-on threshold is higher than
the turn-off threshold. In addition, the MQHL converter will
not respond to a state of the input voltage unless it has
remained in that state for more than about 200s. This
hysteresis and the delay ensure proper operation when the
source impedance is high or in a noisy environment.
INPUT OVER-VOLTAGE SHUTDOWN: The MQHL
converter also has an over-voltage feature that ensures the
converter will be off if the input voltage is too high. It also
has a hysteresis and time delay to ensure proper operation.
OUTPUT OVER-VOLTAGE SHUTDOWN: The MQHL
converter will shut down if the voltage at its power output
pins ever exceeds about 130% of the nominal value. The
shutdown threshold does not change with output trim or
sense drops; excessive trim-up or output wiring drops may
cause an output over-voltage shutdown event. After a
startup inhibit delay, the converter will attempt to restart.
OUTPUT UNDER-VOLTAGE SHUTDOWN: The MQHL
converter will also shut down if the voltage at its power
output pins ever dips below 60% of the nominal value for
more than a few milliseconds. Output voltage reduction
due to output current overload (current limit) is the most
common trigger for this shutdown. The shutdown threshold
does not change with output trim but at only 10%, trim-
down should not trigger this event. After a startup inhibit
delay, the converter will attempt to restart. This shutdown
is disabled during startup.
BACK-DRIVE CURRENT LIMIT: Converters that use
MOSFETs as synchronous rectifiers are capable of drawing
a negative current from the load if the load is a source of
short- or long-term energy. This negative current is referred
to as a “back-drive current”.
Conditions where back-drive current might occur include
paralleled converters that do not employ current sharing.
It can also occur when converters having different output
voltages are connected together through either explicit or
parasitic diodes that, while normally off, become conductive
during startup or shutdown. Finally, some loads, such as
motors, can return energy to their power rail. Even a load
capacitor is a source of back-drive energy for some period of
time during a shutdown transient.
To avoid any problems that might arise due to back-drive
current, the MQHL converters limit the negative current
that the converter can draw from its output terminals. The
threshold for this back-drive current limit is placed sufficiently
below zero so that the converter may operate properly
down to zero load, but its absolute value (see the Electrical
Characteristics page) is small compared to the converter’s
rated output current.
10
100
1000
10000
-10% -8%
-6%
-4%
-2%
0%
2%
4%
6%
8%
10%
Ex
te
rn
al
Tr
im
R
es
is
ta
nc
e
(k
O
hm
s)
Output Voltage Adjustment
Trim Up
Trim Down
Figure E: Trim up and Trim down as a function of external trim resistance.
Load
+
28 Vdc
open
means
on
RTRIM DOWN
RTRIM UP / RTRIM SENSE
MQHL
+VIN
IN RTN
CASE
ENA 1
SYNC OUT
SYNC IN
N/C
TRIM
+SNS
-SNS
OUT RTN
+VOUT
1
2
3
4
5
6
12
11
10
9
8
7
__
_
Figure D: Typical connection for output voltage trimming.
MQHL
advanced
publication
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publication
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